Background: Patch test (PT) appointments are one of a complicated healthcare appointment due to multiple consecutive visits, pre-patch test preparations or bring culprit products on the first test date. The long duration of PT queue can also make patient forgetful. A complete pre-patch test preparation is essential for the best PT benefit. 

Objectives: We aim to find the effectively appointment method by comparing the “Line” messaging application and conventional appointment methods.

Materials and Methods: One hundred and twenty patients were equally randomized into 2 groups: Line appointment group or conventional appointment group. Demographic data, spending time of appointment process and error rate were recorded at the PT appointed date.

Results: The conventional appointment group had higher overall error rate (16.7%) than those in Line appointment group (10.0%) but it was no statistical difference. However, the Line appointment group significantly showed lower time spending in appointment process with high satisfaction rate of the users.

Conclusion: “Line” mobile messaging application is an effectively healthcare appointment reminder and patient’s health educations with no limitation of user by mean of age or level of education.